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Financial Statement Details - Summary of Inventories (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Finished goods $ 9,814 $ 14,331
Raw materials and components 5,211 6,072
Total inventories, net $ 15,025 $ 20,403